Thread (8 messages) flat view 8 messages, 3 authors, 2017-03-22
STALE3431d

Re: [PATCH net-next 1/4] drivers: net: xgene-v2: Add MDIO support

From: Andrew Lunn <andrew@lunn.ch>
Date: 2017-03-21 20:35:50
Also in: linux-arm-kernel

quoted hunk ↗ jump to hunk
@@ -511,9 +512,9 @@ static int xge_close(struct net_device *ndev)
 {
 	struct xge_pdata *pdata = netdev_priv(ndev);
 
-	netif_carrier_off(ndev);
 	netif_stop_queue(ndev);
 	xge_mac_disable(pdata);
+	phy_stop(ndev->phydev);
 
 	xge_intr_disable(pdata);
 	xge_free_irq(ndev);
@@ -683,9 +684,14 @@ static int xge_probe(struct platform_device *pdev)
 	if (ret)
 		goto err;
 
+	spin_lock_init(&pdata->mdio_lock);
+
...
+static int xge_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 data)
+{
+	struct xge_pdata *pdata = bus->priv;
+	u32 done, val = 0;
+	u8 wait = 10;
+	int ret = 0;
+
+	spin_lock(&pdata->mdio_lock);
+
+	SET_REG_BITS(&val, PHY_ADDR, phy_id);
+	SET_REG_BITS(&val, REG_ADDR, reg);
+	xge_wr_csr(pdata, MII_MGMT_ADDRESS, val);
+
+	xge_wr_csr(pdata, MII_MGMT_CONTROL, data);
+	do {
+		usleep_range(5, 10);
+		done = xge_rd_csr(pdata, MII_MGMT_INDICATORS);
+	} while ((done & MII_MGMT_BUSY) && wait--);
+
+	if (done & MII_MGMT_BUSY) {
+		dev_err(&bus->dev, "MII_MGMT write failed\n");
+		ret = -ETIMEDOUT;
+	}
+
+	spin_unlock(&pdata->mdio_lock);
+
+	return ret;
+}
+
+static int xge_mdio_read(struct mii_bus *bus, int phy_id, int reg)
+{
+	struct xge_pdata *pdata = bus->priv;
+	u32 data, done, val = 0;
+	u8 wait = 10;
+
+	spin_lock(&pdata->mdio_lock);
+
Hi Iyappan

Please could you explain what this lock is protecting which the
mii_bus mdio_lock in mdio_bus.c is not protecting?

Thanks
	Andrew
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